Virtual Labs

DSB-SC, SSB-SC Modulator & Detector

If the message signal has a maximum frequency of 5 kHz, what is the required transmission bandwidth for an SSB-SC signal?

a: 5 kHz Explanation

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b: 10 kHz Explanation

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c: 2.5 kHz Explanation

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d: 20 kHz Explanation

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In SSB-SC modulation, why is only one sideband transmitted instead of both?

a: To reduce power consumption Explanation

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b: To save transmission bandwidth Explanation

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c: To increase carrier amplitude Explanation

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d: To avoid using coherent detection Explanation

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Which sideband does SSB-SC transmit if the upper sideband (USB) is selected?

a: The lower frequency sideband only Explanation

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b: Both upper and lower sidebands Explanation

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c: The higher frequency sideband only Explanation

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d: No sideband; only carrier is transmitted Explanation

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A message signal has a maximum frequency of 4 kHz. If we generate an SSB-SC signal using a carrier of 100 kHz, what will be the frequency range of the upper sideband?

a: 100 kHz to 104 kHz Explanation

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b: 96 kHz to 100 kHz Explanation

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c: 100 kHz to 108 kHz Explanation

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d: 92 kHz to 96 kHz Explanation

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In DSB-SC demodulation, what is the effect of a phase mismatch between the transmitter and receiver carrier signals?

a: It changes the frequency of the output signal without affecting amplitude. Explanation

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b: It reduces output amplitude and introduces distortion. Explanation

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c: It has no effect if the signal amplitude is high. Explanation

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d: It increases overall signal power. Explanation

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Which component is essential in SSB-SC modulation to generate a phase-shifted version of the message signal?

a: Balanced amplifier Explanation

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b: Hilbert transformer Explanation

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c: Low-pass filter Explanation

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d: Phase-locked loop Explanation

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In SSB-SC modulation, what is the role of the Hilbert transform of the message signal?

a: It suppresses the carrier completely. Explanation

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b: It generates a 90° phase-shifted version of the message signal to create a single sideband. Explanation

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c: It reduces the message bandwidth by half. Explanation

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d: It directly recovers the message signal at the receiver. Explanation

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In SSB-SC systems, what is the main challenge in achieving perfect carrier suppression?

a: The message signal bandwidth. Explanation

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b: Non-linearities in amplifiers. Explanation

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c: Low power of the transmitted signal. Explanation

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d: Maintaining precise oscillator frequency and phase, and handling non-ideal components. Explanation

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In SSB-SC demodulation, how does noise affect phase detection?

a: Noise improves phase detection. Explanation

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b: Noise affects only amplitude, not phase. Explanation

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c: Noise causes phase jitter, reducing demodulation fidelity. Explanation

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d: Noise has no effect if SNR is high. Explanation

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Calculate the transmitted power of a DSB-SC signal if the message signal is a sinusoid with a peak amplitude of 2 V and is transmitted over a 1 Ω resistive load. (Assume a normalized carrier amplitude of 1 V).

a: 2 W Explanation

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b: 1 W Explanation

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c: 4 W Explanation

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d: 0.5 W Explanation

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